Coding standards

Everything should be in .editorconfig, but the most important things:

1. All things on this repository should be in English.
2. Lines should have maximum 120 chars length.
3. Variables and classes should be named according to the content.
4. Use enums or const and avoid hardcoded texts in your code.
5. DRY - Don't Repeat Yourself.

At the rest of things please apply to default Intellij Idea code format and use Ctr + Alt + L or Code -> Reformat Code before commit.